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CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Revenues: |  |  |  |
Rental income | $ 33,233 | $ 33,753 | $ 103,533 | $ 98,705
Interest income from mortgage loans | 6,677 | 6,958 | 20,050 | 20,347
Interest and other income | 1,336 | 131 | 2,753 | 390
Total revenues | 41,246 | 40,842 | 126,336 | 119,442
Expenses: |  |  |  |
Interest expense | 7,644 | 6,836 | 22,266 | 19,586
Depreciation and amortization | 9,519 | 9,155 | 28,186 | 26,623
Impairment on receivables |  |  | 1,880 |
(Recovery) provision for doubtful accounts | (96) | 43 | (139) | 245
Transaction costs | 34 | 2 | 56 | 96
General and administrative expenses | 4,144 | 4,464 | 13,270 | 12,864
Total expenses | 21,245 | 20,500 | 65,519 | 59,414
Operating income | 20,001 | 20,342 | 60,817 | 60,028
Income from unconsolidated joint ventures | 615 | 289 | 1,635 | 839
Gain on sale of real estate, net |  | 1,780 | 5,054 | 3,582
Net income | 20,616 | 22,411 | 67,506 | 64,449
Income allocated to participating securities | (80) | (90) | (281) | (296)
Net income available to common stockholders | $ 20,536 | $ 22,321 | $ 67,225 | $ 64,153
Earnings per common share: |  |  |  |
Basic (in dollars per share) | $ 0.52 | $ 0.57 | $ 1.71 | $ 1.68
Diluted (in dollars per share) | $ 0.52 | $ 0.57 | $ 1.70 | $ 1.68
Weighted average shares used to calculate earnings per common share: |  |  |  |
Basic (in shares) | 39,428 | 39,057 | 39,403 | 38,161
Diluted (in shares) | 39,748 | 39,335 | 39,738 | 38,455
Dividends per share declared (in dollars per share) | $ 0.57 | $ 0.54 | $ 1.71 | $ 1.62
Dividends paid per common share (in dollars per share) | $ 0.57 | $ 0.54 | $ 1.71 | $ 1.62

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- Definition Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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